www.fltk.net > 递等式计算:72÷8×57×9(23+4)÷356+38)

递等式计算:72÷8×57×9(23+4)÷356+38)

(1)72÷8×5=9×5=45;(2)7×9-17=63-27=36;(3)(23+4)÷3=27

用递等式计算(能巧算的要巧算)488+152+5123463-264-7365673+389-167

38≈40,故38看做40;32≈30,故32看做30

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